Turn-Key Electronics Manufacturing Services for PCB Assembly

Printed circuit board ( PCB) Is all part of the electronic equipment. The PCB welding with electronic components. These electronic components can be THT and SMT.

by:Rigao      2020-03-24
PCBA assembly type people use a variety of ways on the PCB assembly electronic components. The table below gives the main types of PCB assembly: single-sided PCB design function SMD SMD components assembly type chart only welding on the PCB single-sided double-sided SMD SMD assembly in the fluctuation on both sides of the single side of PCB assembly THT and SMD are one-side assembly mix assembly at the top and only at the bottom of the SMD THT and SMD assembly at the top, and bottom only SMD THT is at the top, SMD in THT SMD but on the other side is on one side at the bottom of the PCB type example: there are many applications only SMD components on a single PCB assembly, such as DC - DC converter circuit, we can easily find them in the electronic hardware store. 1 - These are small modular circuit with SMD switch components, such as the inductor, switch voltage regulator IC and SMD resistor and capacitor. 2 - Contains only the double-sided PCB SMD components, such as mobile phone circuit, laptops and PC's RAM, wearable electronics, smart watches. 3 - With mixins single component THT and SMD example is telecom circuit and the graphics card. 4 - Double components, both sides have THT and SMD, such as motherboard, switching power supply circuit, Comput power supply. 5 - PCB single-sided THT, while the other side is SMD LED lamp electronic circuit, energy-saving circuit SMT assembly process: SMT assembly process is specified in the bare PCB solder welding plate coating method. This kind of solder paste in only the PCB's will be placed elements/welding tray with high precision. Then the component is completely in accordance with the digital file specified on the welding plate. This document is in the design of each component ( X, Y) Coordinates, automatic pick and place robots will use this information to automatically pick up components and place it on the pad. Place component, and then through the reflow oven will be solder paste melt under controlled temperature and cooling, to strengthen the bonding pad and SMD components electrical and mechanical connection between the pins. Three main steps 1 - PCBA Solder paste application; 2 - Component installation; 3 - Reflow soldering. 1 - Solder paste application: solder paste application is running at the designer level of the generated model on the automatic machine to complete. The model will help the machine accurately will solder paste daub on the placement and the coordinates of welded components. Therefore, 'print' solder paste machine and forwarding PCB for component installation and reflow soldering. Another method of applying solder paste is through the solder paste stencil. This template by Altium, Eagle and KiCAD software generated. The template file is basically a PCB designers design in the design phase involves the solder paste layer. There are many layers in the PCB, such as the inner layer and outer layer, so the solder paste layer provides the accurate size and location of solder paste, and instructions on these point machine cutting holes or 2 - coating solder paste Component installation of the second step is to install or place in the PCB components. Special PCB can automatically perform the work. Usually installed inside the machine a roll of SMD components, and through the vacuum head picks up components, and in a vacuum release after being placed on the PCB. Automatic machines use the same as the solder paste application software to generate procedures, place the components accurately on the PCB pads. Often use the rapid installation machine with high speed and high precision placed crystal oscillator, small SMT components such as resistors and capacitors. General installation machine speed slow, for IC and large/irregular component. 3 - Reflow soldering the third step is welded components on the PCB. Welding in called 'reflow furnace' machines. To choose from, there are all sorts of reflow soldering furnace to save heating parameters and time value, in order to automatically start and stop the reflow soldering process. Reflow furnace mainly based on the infrared heating, preheating, soaking and refluxing automatically. Wave soldering process molten solder splashes PCB components, thus established the mechanical and electrical connectors. By means of mechanical or electromagnetic force in the form of 'wave' transformed the molten solder to generate the splash. This should produce the molten solder jet flow. Then put the PCB with components through, so that the PCB pad and components for electrical connection between solder joints. Before that, the components mould has been created and components has been inserted. So the PCB with components through the conveyor belt into wave soldering system. After that, the flux and PCB is preheated. Then for wave soldering and cooling. 1 - Component forming and the main purpose of the plug-in components forming components is before entering the wave soldering system, components and PCB perfect connection. So that they don't move and jitter. Now inserted components in the mould, PCB be sent to the phase of wave soldering. 2 - Wave soldering flux, PCB into preheating. Wave soldering, and then cooling to the final stage.
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